Gas jet coupling and valve construction



G. SCHWANK 2,768,678

GAS JET COUPLING AND VALVE CONSTRUCTION Filed Oct. 28, 1954 Oct. 30,1956 United States Patent GAS JET COUPLING AND VALVE CONSTRUCTIONGunther Schwank, KoimKallr, Germany; Rheinisch- Westfaiische RevisionTreuhand Aktiengesellschaft (Treuhand Aktiengesellschaft), and WilhelmFranken, executors of said Gunther Schwank, deceased; assignors toAmerican Infra Red Radiant Co., Inc., New York, N. Y., a corporation ofDelaware Application October 28, 1954, Serial No. 465,410

2 Claims. (Cl. 15\8120) The present invention relates to a gas jetcoupling including an injector jet, the effective cross-section of whichcan be regulated by means of an axially slidable needle valve memberpositioned directly behind the injector jet.

According to the present invention, in addition to being guidedimmediately behind the injector jet, the needle valve member is alsoguided at the end opposite to its needle point by a cylindricalenlargement cooperating with a bore in the housing of the jet coupling.The axial movement of the needle valve member is controlled in onedirection by a spring, and in the other direction by an independentscrew which can be adjusted in a threaded bore of the housing.

The cross-section of the jet aperture, of the needle valve guidepositioned immediately behind the injector jet, and of the bore in thehousing cooperating with the cylindrical enlargement of the needle valveare progressively enlarged in that order. In accordance with thisfeature of the invention, the jet coupling can be assembled before thefinal operation of drilling these bores, and they can all three bedrilled and finished in a single operation, whereby it is possible forthe three bores to be very accurately aligned and for the needle valvemember and the independent adjustment screw to be properly centered withrespect to the jet aperture.

According to another feature of the invention, the separate andindependent relationship of the adjustment screw and of the needle valvemember makes it possible for the needle valve member to be independentof inaccuracies in the machining of the thread cooperating with thescrew. Return movement of the needle valve member in a direction awayfrom the jet aperture is occasioned under spring pressure independentlyof any eccentric forces which might otherwise act upon the needle valvemember and cause jamming thereof in the guides. The needle valve memberis of simple and accurate construction.

The invention having been briefly described will now be described ingreater detail, reference being made to the accompanying drawingillustrating an axial section through one embodiment of the inventiongiven by way of example.

The jet coupling, according to the present invention, is intended,primarily, for use in gas burners. The gaseous fuel enters through bore1 into the chamber 2 of the housing 3. The injector jet 4, having a jetaperture 5, is threaded at 6 into the housing 3. The effectivecrosssection of the jet aperture can be adjusted by axial slidingmovement of the needle valve member 7. The needle valve member 7 isguided in the bore 8 of a disc member 9 immediately behind the injectorjet 4. The disc member is firmly held in the housing 3 by the injectorjet 4, and it is provided with apertures 10 for the fuel flowingtherethrough. At the end thereof opposite to the needle point, theneedle valve member 7 is provided with a simple 2,768,678 Patented Oct.30, 1956 cylindrical enlargement 11, by means of which it is guided inthe bore 12 of the housing 3. Axial movement of the needle valve member7 in a direction to decrease the effective cross-section of the jetaperture 5 occurs in response to the thrust exerted by a regulatingscrew 13 threaded into a threaded bore 14 of the housing 3. The screw 13is preferably provided with a small pin member 15 abutting against theenlargement 11 of the needle valve member 7. The needle valve member 7is springurged by a spring 16, seating against the disc member 9 and theenlargement 11. Thus, the needle valve memher 7 is at all timespositively engaged against the pin member 15. When the screw 13 isunscrewed from the threaded bore 14, the needle valve member 7 is urgedby the spring 16 in a direction to increase the cross-section of the jetaperture 5.

As clearly shown in the drawing, the cross-section of the bore 12 in thehousing 3 is greater than that of the bore 8 in the disc member 9, andthe cross-section of the bore 8 is, in turn, greater than that of thejet aperture 5.

Furthermore, the axis of the screw 13 coincides with that of thethreaded bore 14 and also with that of the needle valve member 7. Hence,the screw 13 is displaceable in the same direction as the needle valvemember 7. This feature, which can be achieved by machining the bore ofthe needle valve member 7 and the bores 8 and 12 in a same finaloperation, is possible only if these three bores are accessible from thetool side of the work-piece, i. e. through the bore 14. The positioningof the needle valve member 7, after the final operation, is possibleonly if it can be inserted from the right through an opening such asbore 14, and the same may be said for removal or replacement of theneedle valve member 7.

The present invention is not limited to the embodiment illustrated inthe accompanying drawing and described herein, modifications thereofbeing possible within the scope of the appended claims.

What is claimed is:

1. A gas jet coupling, comprising a housing having a fuel chamber and aninlet port in fluid communication with said chamber, an injection nozzlehaving a jet aperture and threadedly engaged in said housing at one endthereof, a needle valve member coaxial of said jet aperture and axiallymovable in said housing relative to said jet aperture to vary the fuelflow therethrough, a member for guiding one end portion of said valvemember secured in position in said housing, the latter having aperipheral shoulder and said guide member being clamped in positionagainst said shoulder by said injector nozzle, said guide member havinga coaxial central aperture through which said valve member extends witha sliding fit, said guide member being further apertured to providefluid communication between said chamber and said nozzle, said housinghaving a bore in axial spaced relation to and coaxial with the aperturein said guide member and said valve member having a part extendingthrough said bore and having a sliding fit therewith and guided thereby,spring means surrounding said valve member and seated against said guidemember and said valve member part to resiliently urge said valve memberin a direction away from said jet aperture, a threaded bore at theopposite end of said housing extending to said first mentioned bore andcoaxial therewith, and an adjustment screw threadedly engaged in saidthreaded bore for adjusting the axial position of said valve member,said spring means being effective to resiliently urge said valve memberinto engagement with said adjustment screw, the latter" limiting theaxial movement of said valve member in said direction.

References Cited in the file of this patent UNITED STATES PATENTSHumphrey Nov. 3, 1903 Ullmann Nov. 15, 1904 FOREIGN PATENTS GreatBritain Mar. 13, 1940

